Impact of Ph on Expansion Behavior of Hardened Cement Paste Due to Delayed Ettringite Formation

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Key Points

The study aims to analyze the impact of pH on the expansion behavior of hardened cement paste caused by delayed ettringite formation.
Exposed hardened cement paste with delayed ettringite formation potential to pH-adjusted solutions.
Monitored expansion behavior over a period of 181 days.
Conducted composition analyses post immersion.
At pH 12.5 to 13.1, significant expansion was observed, with crystal growth of ettringite after 181 days.
At pH 13.4, ettringite formation occurred but with a lower expansion rate, likely due to stabilization of monosulfate.
At pH 13.7 and 14.0, no expansion was noted, and potential for delayed ettringite formation was lost.

Research analyzes how pH affects expansion in hardened cement paste, indicating critical implications for construction materials.

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YOSHIDA et al. (2026) studied this question.

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